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Product Warranty (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Product Warranty
Product warranty period	1 year
Changes in standard product warranty liability
Balance at January 1 (beginning of year)	$ 4,612	$ 3,244
Warranties issued during the period	1,288	1,385
Settlements made during the period	(968)	(950)
Changes in estimate of liability for pre-existing warranties during the period	(192)	126
Balance at March 31 (end of period)	4,740	3,805
Product warranty classification
Amount classified as current			$ 4,181	$ 4,280	$ 3,431
Amount classified as long-term			559		374
Total warranty liability	$ 4,740	$ 3,805	$ 4,740	$ 4,612	$ 3,805

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- Definition

Represents the period for which the warranty is offered for the products sold.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty.

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